Elexon confirms P509 Workgroup Meeting 5 took place on 22 September 2026; newly disclosed 13-month Assessment Procedure extension agreed by BSC Panel on 9 July 2026

The 22 September 2026 Elexon P509 page confirms that Workgroup Meeting 5 'took place on 22 September 2026,' converting this milestone from a prospective, scheduled event into a completed one, though no substantive content or outcome from the meeting is disclosed (unlike the detailed CBA-scope summary given for Workgroup Meeting 4). The page also newly reveals that the BSC Panel, at its meeting on 9 July 2026, agreed a 13-month extension to the P509 Assessment Procedure (reference 376/02) — a regulatory governance action not previously captured in the tracked event history.

Confirmation that Workgroup Meeting 5 has occurred moves the process forward procedurally, but the absence of any substantive readout (unlike the granular CBA-scope discussion recorded for Meeting 4) means stakeholders still lack visibility into whether the Workgroup resolved the open question of P509/P510 CBA coordination, gaming-risk treatment, or investment-signal preservation. Separately, the disclosure of the Panel's 9 July 2026 decision to extend the Assessment Procedure by 13 months is a material governance fact explaining why the timetable now runs through November 2027, and it underscores that Ofgem/Panel oversight has already materially lengthened the assessment timeline once.

The pattern of confirming that a meeting 'took place' without summarising its content, in contrast to the detailed recap given for the immediately preceding Workgroup Meeting 4, suggests either that Elexon has not yet finalised a summary of Meeting 5's discussions or that the meeting's outcomes were less conclusive and therefore not yet publishable; either reading implies the CBA-scope and cross-modification coordination questions likely remain unresolved. The newly surfaced 13-month Panel extension decision, while dated 9 July 2026 and therefore not itself a change in this snapshot, appears for the first time in the tracked record and materially explains the elongated timetable relative to what a standard Assessment Procedure duration might otherwise suggest, indicating this Modification has already experienced at least one significant procedural delay.

Balancing and Settlement Code (BSC) Modification process, overseen by Elexon and the BSC Panel with Ofgem as approving Authority

Continued P509 Workgroup Meetings (August 2026 – April 2027)

Primary sources